{"id":"EUVD-2026-77624","revision":"f7ddf07e93e047a3bb7b3e95f47506ea","records":[{"revision":"f7ddf07e93e047a3bb7b3e95f47506ea","observedAt":"2026-11-11T13:59:00.912+00:00","statement":{"source":"euvd","id":"EUVD-2026-77624","aliases":["CVE-2026-54156","GHSA-6wvw-vrw4-363w"],"title":"node-opcua is an OPC UA implementation for TypeScript and Node.js. Prior to 2.166.0, the process-global g_alreadyUsedNonce cache used by nonceAlreadyBeenUsed in packages/node-opcua-secure-channel/source/server/server_secure_channel_layer.ts…","description":"node-opcua is an OPC UA implementation for TypeScript and Node.js. Prior to 2.166.0, the process-global g_alreadyUsedNonce cache used by nonceAlreadyBeenUsed in packages/node-opcua-secure-channel/source/server/server_secure_channel_layer.ts records nonces from OpenSecureChannelRequest and CreateSession without expiration or a size limit. An unauthenticated remote attacker can repeatedly create sessions with unique nonces, causing entries to persist after session expiry and accumulate across connection cycles even when maxSessions=10 limits concurrent sessions. The resulting unbounded heap growth can exhaust the default Node.js heap and crash the node-opcua server process. This issue is fixed in version 2.166.0.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":null}],"references":["https://github.com/node-opcua/node-opcua/security/advisories/GHSA-6wvw-vrw4-363w","https://github.com/node-opcua/node-opcua/commit/b82c2939fe9c658de58da993f2798ec5481d7313","https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-77624","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 14, 2026, 4:09:07 PM","dateUpdated":"Sep 14, 2026, 4:35:48 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-77624","identifiers":["EUVD-2026-77624","CVE-2026-54156","GHSA-6wvw-vrw4-363w"]},"retained":false,"historicalAffected":[]}],"coverage":[]}